// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use crate::dialect::Dialect;

/// A [`Dialect`] for [Hive](https://hive.apache.org/).
#[derive(Debug)]
pub struct HiveDialect {}

impl Dialect for HiveDialect {
    fn is_delimited_identifier_start(&self, ch: char) -> bool {
        (ch == '"') || (ch == '`')
    }

    fn is_identifier_start(&self, ch: char) -> bool {
        ch.is_ascii_lowercase() || ch.is_ascii_uppercase() || ch.is_ascii_digit() || ch == '$'
    }

    fn is_identifier_part(&self, ch: char) -> bool {
        ch.is_ascii_lowercase()
            || ch.is_ascii_uppercase()
            || ch.is_ascii_digit()
            || ch == '_'
            || ch == '$'
            || ch == '{'
            || ch == '}'
    }

    fn supports_filter_during_aggregation(&self) -> bool {
        true
    }

    fn supports_numeric_prefix(&self) -> bool {
        true
    }
}
